package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    private static final Integer Number = 1;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 设置购物车用户 只能查询自己购物车的数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        // 判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);

        // 如果存在，则商品数量+1
        if (shoppingCarts != null && shoppingCarts.size() > 0){
            // 如果存在只能查询到一条数据
            shoppingCart = shoppingCarts.get(0);
            // 商品数量+1
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            // 如果不存在，插入数据，商品数量初始值是1

            // 判断当前商品是套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                // 添加的商品是菜品 补全订单数据
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                // 添加的商品是套餐 补全订单数据
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            // 统一补全商品初始份数 创建时间
            shoppingCart.setNumber(Number);
            shoppingCart.setCreateTime(LocalDateTime.now());
            // 向订单数据库中插入数据
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                                        .userId(BaseContext.getCurrentId())
                                        .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        return shoppingCartList;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
}
